Hand-drill.



No. es|,5o9. r Patented Aug. 22, I899. s. r. NICHOLS.

.HAND DRILL.

(Application filed Mar. 25, 1898.) (No Model.) 3 Sheets-Sheet l.

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- S. F. NICHOLS.

HAND DRILL.

. (Application filed Mar. 25, 1598.)

(No MoqeI.) 3 Sheets-Sheet 2.

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H A N D D R l L L (Application filed Mar. 25, 1898.)

(No Model.)

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UNITED STATES PATENT OFF CE.

SAMUEL F. NIOIIOLS,'OF NEW YORK, N. Y.

HAND-DRILL.

SPEGIFICATIOIF forming part of Letters Patent No. 631,509, dated August22, 1899.

Application filed March 25, 1898. Serial No. 675,155. (No model.)

To all whom it may concern:

Be it known that I, SAMUEL F. NICHOLS, a citizen of the United States,residing at New York, in the county of New York and State of New York,have invented certain new and useful Improvements in Hand-D ril1s,ofwhich the following is a full and complete specification, such as willenable those skilled in the art to which it appertains to make and usethe same. I

This invention relates to hand-drills; and the object thereof is toprovide an improved device of this class which is simple in constructionand operation and which is particularly adapted for use as a dentaldrill, but which may be used wherever hand-drills are required.

The invention is fully disclosed in the following specification, ofwhich the accompa panying drawings form a part, in which- Figure l is aside view of my improved drill. Fig. 2 is an end view looking in thedirection of the arrow at of Fig. 1. Fig. 3 is a bottom plan view of thedrill shown in Fig. 1. Fig. 4 is an end view looking in the direction ofthe arrow 0, of Fig. 1. Fig. 5 is a View simi-f lar to Fig. 1, the bodyportion of the drill be ing shown in longitudinal vertical section. Fig.6 is a view similar to Fig. 5, on an en larged scale, showing a part ofthe body por-' tion of the drill and the drill-head in section. Fig. 7is a section on the line 7 7 of Fig. 5, and Fig. 8 is a section ontheline 8 8 of Fig 5.

In the drawings forming part of this specification the separate parts ofmy improvement are designated by the same numerals of reference in eachof the views, and in the practice of my invention I provide a tubularcasing 10, the ends of which are closed byscrew-threaded plugs 11 and12, respectively, and the bottom of the casing 10 is provided with alongitudinal slot 13, which extends through the greater part of itslength, but both ends of which are closed.

Mounted in the tubular casing 10 is a main shaft 14, provided with ascrew-thread of great pitch and one end of which is pivoted in the plug12, as shown at 15, and mounted on said shaft is a short cylinder 16,which is provided with a central longitudinal bore having a femalethread corresponding with the thread on the shaft 14, and between thecylinder 16 and the plug 12 is a spiral spring 17. That end of the shaft14 opposite the plug 12 is provided with a cylindricalextension 18, inwhich is formed a transverse slot 19, which opens outwardly, and saidcylindrical extension 18 rests in a central bore formed in the pluglland said plug 11 is provided with an outwardly-directed screw-threadedtubular extension 20,0n which is mounted a screw-threaded cap 21, theouter end of which is provided with an inwardly-directed annular flange22, and said plug 11,is also provided with an annular flange 23, whichabuts against the end of the tubular casing 10. I also provide a shorttube 24, which passes through the cap 21 and into the screw-threadedextension 20 and which is provided adjacent to its inner end with anannular flange 25, which abuts against the end of said extension, andsaidtube 24 is held in place by the annular inwardly-directed flange 22on the cap 21.

In the form of construction shown in the drawings I connect with theouter end of the tube 24, in any desired manner, an elbow-tube 26,andmounted in the tube 24 is a short supplemental shaft 27, which isprovided at its inner end with a cylindrical head 28, on which is formeda flat lug or projection 29, which is adapted to enter the slot 19 inthe cylindrical extension 18 of the main shaft 14, and said supplementalshaft 27 is adapted to revolve in the tube 24 and is provided at itsouter end with a beveled gear-wheel 30, and mounted in th'e'arm of theelbow-tube 26, which projects at right angles to the tube 24, is ashortdrill-shaft 31, on the upper end of. which is a beveled gear 32, whichoperates in connection with the beveled gear 30, and the lower end ofthe drill-shaft 31 passes through a plug 33 and is provided at its lowerend with a drill 34, which may be of any desired form.

Mounted on the tubular casing 10 is a band 35, through which is passedaset-screw 36, and one side of said band is provided with ascrew-threaded extension 37, by means of which a handle 38 is connectedtherewith, and by means of the set-screw 36 and the band 35 the handle38 may be ad justed longitudinally and held in any desired, position" onthe easing 10 and may also be turned and adjusted laterally withreference thereto. The cylinder 16 in the tubular casing 10, which isadapted to move on and longitudinally of the main shaft 14., is providedat one side with a lug 30, which passes through the slot 13 in thetubular casing 10 and which is provided with a ring 10, and by means ofthe cap 21 the tube 24 may be turned and adjusted laterally, so that theangular extension thereof which carries the drill-shaft 31 may be heldat any desired lateral angle with reference to the casing 10.

It will be understood that the cylindrical head 28 of the supplementalshaft 27 is always connected with the main shaft 14, as shown in Fig. 6,and said supplemental shaft 27 is turned or operated by the said mainshaft, and the operation will be readily understood from the foregoingdescription when taken in connection with the accompanying drawings andthe following statement thereof:

In practice the handle 38 is grasped in the hand and the index or otherfinger is passed through the ring 40, and by pulling on the ring 40 inthe direction of the handle 38 the cylinder 16 will be caused to movealong the main shaft 1-1 in the direction of said handle, and then byreleasing said ring or by releasing the pressure thereon the spring 17will force said cylinder outwardly into the position shown in Fig. 5. Itwill be understood that this operation may be performed very quickly,all that is necessary being a quick pull on the ring 40 and an equallyquick relaxa tion of the pressure applied thereto, and in this operationthe cylinder 16 is moved back and forth, as described. This operationalso gives to the main shaft 14 a quick revolution in both directions,and this movement is transmitted to the supplemental shaft 27 by thecylindrical head 18 of the main shaft. The movement of the shaft 27 istransmitted to the drill-shaft 31, and said drill-shaft is similarlyoperated, being revolved rapidly in one direction and the movementthereof being correspondingly reversed and said shaft being as rapidlyrevolved in the opposite direction. This movement may be kept up as longas it is desired to operate the drill, and it will be apparent that manychanges in and modifications of the construction herein described may bemade without departing from the spirit of my invention or sacrificingits advantages.

By supporting the drill-shaft 31 at an angle to the main andsupplemental shafts, as shown and described, my improved drill isrendered particularly applicable for dental operations, and the saidelbow-tube, or that part thereof which carries the drill-shaft 31, maybe laterally adjusted on its supports, which also facilitates saidoperation.

The finger-piece i0 is preferably connected with the cylinder 16, asshown in Figs. 5, 6, and 7, said finger-piece being provided with ashank having a screw-threaded extension which passes through the slot oropening in the bottom of the tubular casing 10; but any and will befound to be of great value wherever hand-drills are required, and thesame is particularly adapted for use in dentistry work.

Having fully described my invention, I claim as new and desire to secureby Letters Patent-- 1. A hand-drill, comprising a tubular casing theends of which are closed by plugs, one of which is provided with acentral bore, and a screw-threaded extension, said casin g being alsoprovided in one side thereof with a 1011- gitudinal slot, a handlemounted on said casing and longitudinally adjustable thereon, a mainscrew-threaded shaft mounted in said casing, one end of which is pivotedin one of said plugs, and the other end of which is provided with acylindrical extension which enters the bore in the other plug, acylinder mounted on said main shaft within said casing and provided witha central longitudinal bore having a thread which corresponds with thatformed on said main shaft, said cylinder being also provided at one sidewith a finger-piece which passes through the slot in said casing, aspiral spring mounted in said casing between said cylinder and thepivoted end of said shaft, a cap mounted on the extension of the plughaving a central bore, a tube which passes through said cap and intosaid extension, and is held in place by said cap, a supplemental shaftmounted in said tube and provided at its inner end with a head which isadapted to engage with the cylindrical extension of the main shaft, abeveled gear mounted on the outer end of said supplemental shaft, a tubeconnected with the tube in which the supplemental shaft is mounted, anda drill-shaft mounted in said last-named tube, and a beveled gear-wheelmounted on the inner end of said shaft in mesh with the beveled gearwheel. on said supplemental shaft.

2. A hand-drill, comprising a tubular casing having a longitudinal slotin one side thereof,a rotatable main shaft mounted therein, a slidingcylinder mounted on said shaft and provided with a finger-piece whichpasses through the slot in the tubular casing, said cylinder and saidshaft being provided with corresponding threads, a spiral spring mountedin said casing and adapted to bear on the inner end of said cylinder toforce it outwardly, a drill-shaft in operative connection with the endof said main shaft, and a handle mounted on said casing and laterallyand longitudinally adjustable thereon, substantially as shown anddescribed.

3. A hand-drill, comprising a main tubular casing provided in one sidewith a longitudinal slot, and the ends of which are closed by plugs, oneof which is provided with a central bore, and a tubular screw-threadedextension, a spring-operated cylinder mounted in said casing andprovided with a finger-piece which passes through the longitudinal slottherein, a main shaft rotatably mounted in said casing passing throughsaid cylinder, and provided at one end with a cylindrical extensionwhich projects into said bore, said shaft and said cylinder beingcorrespondingly threaded, a drill-shaft in operative connection withsaid extension and laterally adjustable, a handle mounted on said casingand longitudinally and laterally adjustable thereon, substantially asshown and described.

4. A hand-drill, comprising a tubular casing having a longitudinal slotin one side thereof, and the ends of which are closed by screw-threadedplugs, one of said plugs being provided with a central bore, and atubular screw threaded extension, a main screwthreaded shaft mounted insaid casing, one end of which is pivoted in one of said plugs, and theother end provided with a cylindrical extension which enters the bore ofthe other plug, a spring-operated screw-threaded cyla beveled gear-wheelmounted on the inner end of said drill-shaft and adapted to operate inconnection with the said beveled gear on the supplemental shaft, and ahandle mounted on said casing, substantially as described. In testimonythat I claim the foregoing as my invention I have signed my name, inpresence of the subscribing witnesses, this 23d day of March, 1898.

SAMUEL F. NICHOLS. Witnesses:

L. M. MULLER, M. R. KNOWLES.

